Doppelgangers don't have always the same name in DC Multiverse.
Stephen Amell portrayed Green Arrow in DC show Arrow, he also portrayed Casey Jones in TMNT: Out of the Shadows. TMNT is somehow part of DC Multiverse. So movie version Casey Jones is a doppelganger of Arrowverse Earth-1 Oliver Queen? (Like 90s Flash and Earth-3 Arrowverse Jay Garrick)